<template>
  <div class="login_container">
    <vue-particles
        color="#409EFF"
        :particleOpacity="0.7"
        :particlesNumber="60"
        shapeType="circle"
        :particleSize="6"
        linesColor="#409EFF"
        :linesWidth="1"
        :lineLinked="true"
        :lineOpacity="0.4"
        :linesDistance="150"
        :moveSpeed="3"
        :hoverEffect="true"
        hoverMode="grab"
        :clickEffect="true"
        clickMode="push">
    </vue-particles>

    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/微信图片_20210728083339.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username" >
          <el-input prefix-icon="el-icon-user" v-model="loginForm.username">
          </el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password" >
          <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password">
          </el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login" @keyup="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: ''
      },
      // 这是表单验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          {
            min: 6,
            max: 15,
            message: '长度在 6 到 15 个字符',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登录表单
    resetLoginForm () {
      // console.log(this) // VueComponent
      this.$refs.loginFormRef.resetFields('00')
    },
    login () {
      this.$refs.loginFormRef.validate(async (valid) => {
        // console.log(valid) // false/ture
        if (!valid) return
        const { data: result } = await this.$http.post('login', this.loginForm)
        // console.log(result)
        if (result.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 将登录成功之后的token 保存到客户端的 sessionStorage 中（会话期间的存储机制）（所以不放在loaclStorage中）
        console.log(result)
        window.sessionStorage.setItem('token', result.data.token)
        // 通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>
<style scoped>
.box{
  height: 10px;
  margin: 70px ;
  size: 20px;
  width: 180px;
}
.login_container {

  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
}

img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #eee;
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
#particles-js {
  width: 100%;
  height: calc(100% - 100px);
  position: absolute;
}
</style>
